Embroidering-machine.



R. ZAHN, DEGD.

A. RIETZSOH, ADMINISTRATOR.

EMBROIDERING MACHINE.

APPLICATION FILED QEPT. 20, 1912.

Patented June 30, 191% COLUMBIA PLANOGRAPM c.

UNTTED STATES PATENT @FFTCE.

ROBERT ZAHN, OF PLAUEN, GERIIIANY; ALFRED RIETZSCE ADMINISTRATOR OF SAIDZAHN, DECEASED.

EMBROIDERING-MACHINE.

Specification of Letters Patent.

Patented June 30, 1914.

. Application filed. September 20, 1912. Serial No. 721,473.

To all 007mm it may concern Be it known that 1, ROBERT ZAHN, a subjcctof the German Emperor, residing at Plauen, Vogtland, in the Kingdom ofS2LX ony, Germany, have invented certain new and useful Improvements inEmbroidering- Machines, of which the following is a specilication.

It is well known that with ordinary or non-automatic shuttleembroidering Inachines the operator has to slacken the needle threadbefore the boring operation begins. Such slackening of the needle threadtakes place at the moment when the fabric frame is vertically displacedto such an extent that the places of the embroidery fabric at which justa little while ago the needles have been operating come into the rangeof the points of the borers.

In accordance with the present invention the slackening of the needlethread is effected automatically. The thread take up mechanism isreleased from the driving means and during the entire period of boringis held in such a position that the thread is slackened, while the mainshaft of the machine is allowed to run with its usual speed.

One embodiment of my invention is illus trated in the accompanyingdrawing in which similar reference letters denote corresponding partsand in which Figure 1 shows the thread take up mechanism in operatingposition and Fig. 2

' shows the same in released position.

In the drawing which forms a part of this specification 1 denotes themain shaft of the embroidering machine, which carries the threadcontrolling cam 2. Rolling on the circumference of this cam by means ofa roller 3 is a double armed lever 3. The thread take up mechanismconsists of the bell crank levers 5, 7 pivotally connected to oneanother by a rod 6, which is actuated bv a spring 15, one end of whichis secured to the frame 18 and the other end to the rod 6. Pivotallyconnected at one end to the bell crank lever is a coupling rod 4, theother end of which is pivotally connected to a rod 1 1 and which isprovided with a notch 41 capable of engaging the lever 3. Fulcrumed inthe frame 18 is a bell crank lever 13 which by a pin 13 slidably engagesa loop or notch 14: provided in the rod 1 1. One arm of this lever 13 bya spring 17 is connected to the rod 14:. The other arm of the bell cranklever 13 is pivotally connected by a rod 12 to a double armed lever Bfulcrumed at 8 to the frame. This double armed lever is connected to therod 10 which in well known manner is operated from the jacquardmechanism denoted by the box 9. The double armed lever 3 is formed witha cam shaped projection 8 and the bell crank lever 5 with a nose 5adapted to be operated by said cam to slacken and temporarily maintainthe thread in slackened state.

The mode of operation is as follows: In passing from ordinaryembroidering to boring the jacquard mechanism automatically causes inwell knownmanner the rod 10 to rise, whereby the lever 8 is tilted sothat its cam 8 is moved toward the projection 5 whereby the levers 5, 7are tilted into the position shown in Fig. 2 in which the thread 16 isslackened. Simultaneously through the medium of rod 12 the lever 13 isturned which through the medium of the rod 141 lifts the coupling rod 4out of engagement with the driven lever 3. Thus the thread take upmechanism is uncoupled from the driving means, which are continued tooperate with the usual speed.

The thread 16 remains in slackened state during the entire boringoperation. Now when passing from boring back to ordinary embroideringthe rod 10 is automatically pulled down by the jacquard mechanismwhereby the cam 8 iscaused to release the bell crank levers 5, 7 whichowing to the spring 15 return into their initial position tensioning thethread 16 and simultaneously the lever 13 is tilted back, whereupon thespring 17 through the medium of the rod 14 presses the coupling rod 4onto the lever 3, which in its turn is caused to reengage the notch 4thereof coupling the thread take up mechanism to the driving means. Itis understood that the means above referred to may also be used at thetransition from embroidering to any other special function, where theslackening of the needle thread is required.

What I claim and desire to secure by Letters Patent is:

1. In a jacquard embroidering machine, the combination with the maindriving means and the needle thread take up device, of jacquardcontrolled means adapted to normally couple the said take up device tosaid driving means and at the transition from embroidering to anyspecial function to automatically uncouple the said take up device fromthe said driving means and to simultaneously put the take up into andmain- I tain the same in a position in which the needle thread isslackened.

2. In a jacquard embroidering machine, the combination with the maindriving means and the needle thread take up device, of a releasableconnection between said take up device and said driving means and ajacquard controlled means adapted at the transition from embroidering toany special function to automatically uncouple the said take up devicefrom the said driving means and to simultaneously put the take up intoand maintain the same in a position in which the needle thread isslackened.

8. In a jacquard embroidering machine, the combination with the maindriving means and the needle thread take up device, including the springactuated needle thread take-up levers, of a releasable connectionbetween said levers and the said driving means and a jacquard controlledmeans adapted at the transition from embroidering to any specialfunction to automatically uncouple the said levers from said drivingmeans and to simultaneously put said takeup levers into and maintain thesame in a position in which the needle thread is slackened.

4. In a jacquard embroidering machine,

the combination with the main driving means and the thread take updevice, of a spring actuated releasable connection between said talre updevice and the saiddriving means and a jacquard controlled means adaptedat the transition from embroidering to any special function toautomatically uncouple the said take up device from the said drivingmeans and to simultaneously put said takeup device into and maintain thesame in a position in which the needle thread is slackened.

5. In a jacquard embroidering machine, the combination with the threadtake up device, and the driven lever controlling the latter, of acoupling member bet-ween said take up device and said lever and jacquardcontrolled means operatively connected to said coupling member andadapted to cooperate with the said take up device so that at thetransition from embroidering to any special function the said couplingmember will be automatically disengaged from the said driven lever andsimultaneously the said take up device will be put into and maintainedin a position in which the needle thread will be slackened.

In testimony whereof I affiX my signature in presence of two witnesses.

ROBERT ZAHN.

Witnesses:

A. CURTIS ROTH, ROBERT HEINRIGH VIER.

Gopies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). C.

